(2014·山东省实验中学一模)—Have you graduated from Shandong University?—Yes.I________there for 4 years.
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A
studied 
B
have studied
C
had studied 
D
have been studying
推荐题目
You     to ask the teacher if you want to hace a day off.
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A
are supposed
B
suppose
C
are allowed
D
allow
 Facing danger, he always _____ calm.
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A
seems
B
remains
C
becomes
D
appears
 I didn’t know your telephone number; otherwise, I ______ you long ago.
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A
had rung
B
have rung
C
would have rung
D
would ring